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Segment Reporting (Summary of Financial Information Concerning Company's Reportable Segments) (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 USD ($) segment | Mar. 31, 2016 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | $ 1,091,266 |  | $ 514,680 |
Segment EBITDA | [1] | $ 318,835 |  | 159,806 |
Number of operating segments | segment |  | 6 |  |  |
Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | $ (151,580) |  | (70,360) |
Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 1,242,846 |  | 585,040 |
Segment EBITDA |  | 334,456 |  | 168,294 |
Southern [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 280,123 |  | 36,919 |
Segment EBITDA | [1] | 68,940 |  | 9,489 |
Southern [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (37,216) |  | (6,048) |
Southern [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 317,339 |  | 42,967 |
Western [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 235,590 |  | 219,234 |
Segment EBITDA | [1] | 75,569 |  | 73,789 |
Western [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (28,411) |  | (27,630) |
Western [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 264,001 |  | 246,864 |
Eastern [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 231,487 |  | 107,795 |
Segment EBITDA | [1] | 65,450 |  | 34,614 |
Eastern [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (41,810) |  | (20,421) |
Eastern [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 273,297 |  | 128,216 |
Canada [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 163,035 |  |  |
Segment EBITDA | [1] | 57,300 |  |  |
Canada [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (22,296) |  |  |
Canada [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 185,331 |  |  |
Central [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 144,309 | [3] | 119,937 |
Segment EBITDA | [1] | 52,652 | [3] | 43,853 |
Central [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (19,503) | [3] | (13,961) |
Central [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 163,812 | [3] | 133,898 |
Exploration and Production [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 36,722 |  | 30,795 | [3]
Segment EBITDA | [1] | 14,545 |  | 6,549 | [3]
Exploration and Production [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2] | (2,344) |  | (2,300) | [3]
Exploration and Production [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue |  | 39,066 |  | 33,095 | [3]
Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [3] |  |  |  |
Segment EBITDA | [1],[3] | $ (15,621) |  | (8,488) |
Corporate [Member] | Intercompany Revenues [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [2],[3] |  |  |  |
Corporate [Member] | Reportable Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Revenue | [3] |  |  |  |
[1] | For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company's most recent Annual Report on Form 10-K.
[2] | Intercompany revenues reflect each segment's total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are generally made on a basis intended to reflect the market value of the service.
[3] | Corporate functions include accounting, legal, tax, treasury, information technology, risk management, human resources, training and other administrative functions. Amounts reflected are net of allocations to the six operating segments.

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Segment Reporting Information EBITDA, which the Company defines as earnings before interest, taxes, depreciation, amortization, impairments and other operating items, other income (expense) and foreign currency transaction gain (loss). + References No definition available. + Details
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